Dynamo-electric machine.



L. B. UNDERWOOD. DYNAMO ELECTRIC MACHINE APPLICATION TILED APR.3,190;. 960,449.

Patented June 7,1910.

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LEIU I: E. UNDERWUEID.

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unrrnn STATES PATENT OFFICE-.1

LOUIS E. UNDERWOOD, F LYNN, MASSACHUSETTS, ASSIGNOR TO GENERAL ELECTRIC COMPANY, A CORPORATION OF NEW YORK.

DYNAMO-ELECTRIC MACHINE.

seams.

Specification of Letters Patent.

Patented June 7, 1910.

Application filed April 3, 1909. Serial No. 487,683.

To all whom it may concern Be it known that I, Louis E. UNDER- wooo, a citizen of the United States, residing at Lynn, county of Essex, State of Massachusetts, have invented certain new My invention relates to dynamo-electric machines and more particularly to the ventilation of suchmachines, and has for its object to provide a simple arrangementand construction of parts for this purpose.

The various features of novelty which characterize my invention are pointed out with particularity in the claims annexed to and forming a part of this specification. For a better understanding of my inven- -tion, however, and the advantages possessed by it, reference may be had to the following description,- taken in connection with the accompanying drawings, in which Figure l. is a side elevation of a dynamoelectric machine embodying my invention, with parts broken away and in section; Fig.

2 is an end elevation of the machine in. Fig.

' 1 with theend member removed; and Fig. 3 is an end elevation similar to Fig. 2 with the end member in place and partly in section through the bearing in the end member.

Referring to the drawings, the dynamoelectric machine has a rotatable member 1 to which is fastened a fan member comprising a disk 2 having openings 8 therein and fan blades 4 extending therefrom, the openings 3 being between the fan blades 4. The rotatable member 1 is mounted on a shaft 5 which is journaled in bearings 6 and 27 in the end' members 8 and 9. The end members are fastened to the frame 9 of the dynamo-electric machine. The end member 8 has openings 10 around the shaft bearing 6 forconduoting air to the openings 3 in the disk the diskbeing close to and covering the openings 10.

The frame member 9 has bolted thereto, field poles 11 provided With laminated tips 12 and exciting coils 13. 8 and 9 are fastened to the frame member 9 by means of bolts 14 passing through lugs on the end members. The bearings 6 and 7 are each provided witht-wo solid rings 15 which are inserted through the elliptical holes 16 formed in the ends of the The end members bearings. The bearing covers 17 each have a projecting lug 18, wlnclnwhen the covers are down, extend over the rings and prevent them from jumping out of their grooves in the bearing linings 19. The winding 20 on the rotatable member is connected to a commutator 21. Brushes mounted on the studs 22 collect from the commutator. studs are fastened to a ring 23 which is mounted on a projecting portion 24 of the bearing.

The rotatable member is provided with a spider which has a projecting flange portion 25, to which the fan member is fastened by meansof screws 26. The flange portion proj ects over the bearing 6 and thereby the total length of the machine is decreased. I prefer to make the fan member out of-sheet metal, pinching the blades'out of the body of the disk andthen bending them so as to form radial blades. I- may make the disk of substantially the same diameter as that of the rotatable member, as shown in the drawing, so that the rotatable member may be removed from within the field poles in either direction Without disturbing the fan member.

-The commutator end member 9 is practically open due to the openings 27 therein which are substantially of the same outside diameter as the inside diameter of the frame. The pulley end member 8 is closed except for the small openings 10 around the bearing 6. The outside diameter of these openings 10 is substantially the same as that of the disk 2.

The openings 10 are close to the disk 2 and conduct air to the openings 3 in the disk. By means of the fan blades 4 the air is forced against the armature windings 10 and the field spools 13 thereby cooling them, the heated air escaping through the openings 27 in the end member 9.

\Vhat I claim as new and desire to secure by Letters Patent of the United States, is

1. In a dynamo electric machine, a frame member, an end member fastened thereto, a shaft, a rotatable member mounted thereon, said end member having a bearing in which said shaft is journaled and openings around the bearing, and a fan member comprising a rotatable disk mounted in close proximity to and covering the openings in said end member, fan blades extending from said disk These on the inside thereof and opening!) in said disk between the fan blades and opposite to the openings in said end member.

2. In a dynamo electric machine, a frame member, an end member fastened thereto, a shaft, a rotatable member mounted thereon, said end member having abearing in which said shaft is journaled and openings around the bearing, and afan member comprising a sheet metal disk mounted in close proximity to and coverin the openings in said end member, fan blades bent up out of said disk on the inside thereof and openings in said disks between the fan blades and opposite to the openings in said end member.

3. In a dynamo-electric machine, a frame member, an end member fastened thereto, a rotatable member mounted on a shaft and having a flange member, a fan fastened to said flange member comprising a disk having openings therein and fan blades extending therefrom, said end member having a bearing in Which said shaft is journaled and dver which said flange member projects and openings of substantiall the same outside diameter as the diameter of the disk for conducting air to the openings in said disk.

4. In a dynamo-electric machine, a frame member, an end member fastened thereto, a rotatable member mounted on a shaft, a fan member fastened to said rotatable member comprising a sheet metal disk having openings punched therein and fan blades bent'z-ip out of said disk, said end member having a bearing in which said shaft is journaled and openings around the bearing for conducting air to the openiiags in said disk, said disk being in proximityto the openings in 

